Lock.



N. B. HURD.

LOCK.

APPLICATION FILED Jun 3, 1914.

Patented Apr. 27, 1915.

4 SHEETSSHEET 1- THE NORRIS PETERS CO-, FHOTO-LITHOH WASHINGTON. D, C.

N. B. HURD.

LOCK.

APPLICATION FILED mus. 1914.

Patented Apr. 27, 1915.

4 SHEETS-SHEET 2- THE NuRR/S PETERS 60.. PMOTO-LITHQ, WASHINGTON. D. c.

N. B. HURD.

LOCK.

1,137,210. APPLICATION FILED JULY 3, 1914. Patented Apr. 27, 1915' 4SHEETS-SHEET 3.

Q/Vi lme/weo avwemmz 0 H J75r/7za/z 5 Hard Y I I I ,1 I I THE NORRISPETERS O.. PHO7D-LITHO WASHINGNN. D C.

unrrn STATES rare 1 ion NORMAN B. HUBI), OF NEW BRITAIN, CO

NNECTICUT, ASSIGNOR TO THE AMERICAN CONNECTICUT.

LOCK.

Specification of Letters Patent.

Patented Apr. 27, 1915.

Application filed July 3, 1914. Serial No. 848,845.

ToaZZ whom it may concern Be it known that I, NORMAN B. HURD, a" citizenof the UnitedStates, residing at New Britain, county of Hartford, Stateof Connecticut, have invented certain new and useful Improvements inLocks, of which the'following is a full, clear, and exact description.

This invention relates-to locks and particularly to an improved lockconstruction affording a plural key-control of a particularlyadvantageous character; and-including also an improved form of thumbbolt control as will be seen from the detailed specification followingand from the accoms panying drawings forming part thereof andillustrating a preferable embodiment of the invention.

In these drawings, Figure 1 is a view in elevation of a mortise lockembodying the improved structure of the present invention, the coverplate of the lock casing being removed to disclose the interiorconstruction. Fig. 2 is an elevation of the lock with the cover plateremoved and withthe thumb bolt projected through the thumb turn, theemergency tumbler and latch bolt mechanism being removed. Fig. 3 is aview similar to Fig. 2 but with the thumb bolt in the process ofretraction through the key bolt and the mechanism controlled by acer-.tain key. Fig. l is a-view in elevation, showing the key bolt in processof projection by an other and certain key and with the blocking memberin process of movement to blocking position. Fig. 5 is a view similar toFig. t but with the key bolt projected by the key of Fig. l and with theblocking member in key bolt blocking position. Fig. 6 is a verticalsection on the line 66 of Fig. 1. Fig. 7 is an enlarged detail view inelevation of the specific form of cylinder lock mechanism employed,parts being shown in section. Figs. 8, 9 and 10 are plan views of threedifferent keys which may be employed in conjunction with the cylinderlock and which aretypical of three different controls. Figs. 11 to 14inclusive are detail views of parts of the mechanism within the lockcase.

Referring to the drawings by numerals, 1 indicates the lock case, 1 thecover plate thereof, and 2 the face plate of said case, these partsbeing generally of standard construction. Mounted in the lock case forreciprocation, and arranged to extend through the face plate as usual,is a key bolt 3 having its upper edge notched as at 4; for cooperationwith the tumbler mechanism and with the roll back of the cylinder lookas will be seen. The key bolt 3 is longitudinally slotted to cooperatewith the usual fixed post or fence 0 carried by the lock case and onwhich the key bolt guides. Pivotally mounted on this key bolt adjacentits forward end is a tumbler 6 of usual construction, having the offsetlug 6 extending over and within the notched edge 4: of the key bolt, andhaving on its outer face a lug 6 designed to cooperate with a second andemergency: tumbler 7. This second tumbler 7, has a sliding slottedengagement with the pivot of the first tumbler 6 as at 7*. Both thetumblers 6 and 7 are gated in the usual manner to cooperate with thefixed fence 5 of the lock case. The tumbler 7 lies in a differentoperative plane from the tumbler 6. The rear face of the tumbler 7 iscut away at 7 to form a guiding wall designed to rest over the lug 6 ofthe first tumbler 6, so that when the second tumbler 7 is depressed, thefirst tumbler 6 will be likewise depressed, so that both tumblers may bemoved to clear the fixed fence 5 simultaneously and by key controlledmeans which will operate the second tumbler 7. It will also be observedthat the curved guiding wall 7 permits the gfirst tumbler 6 to be movedoutwardly with the bolt independently of the second tumbler, the lug 6in this instance, riding over the curved wall 7 as will be readilyapparent. When the two tumblers are depressed, and the key boltprojected outwardly, the tumbler 6 will be positively carried outwardlyby the bolt and its lug 6 engaging with the wall 7 of tumbler 7 willmove this tumbler outwardly with it, positioning the gated portionsofboth tumblers on the opposite side of the fixed fence 5 and blockingretraction of the bolt until both said tumblers have been moved to freethe gated portions from said fence. This second tumbler 7 cooperateswith certain thumb bolt mechanism hereinbefore described, and to thatend is extended downwardly and rearwardly, being rovided with areleasing shoulder 8 and with a thumb bolt arm 9, these parts beingpreferably integral with the tumbler 7. This thumb bolt is designated by10 inthe drawings, its upper end being notched at 11 to receive the arm12 of a thumb turn hub 13 suitably journaled in the lock-case. The arm12, when the hub is turned,'operating to engage with the sides of thenotch 11 and move the thumb bolt to projected and retracted position,the tumbler mechanism of the key bolt being suitably controlled, as willbe seen. The thumb bolt is suitably guided in the lock case, and has itsinner face slotted at 14 to receive the lower end of a walking beam'1'5,pivotally mounted intermediate its ends in the lock case, and having itsupper end engaging in a notch 16 formed in the lower edge of the keybolt 3, so that when the thumb bolt is projected,

- the projection of the key bolt by'said keys will, through this walkingbeam, retract the thumb bolt, the key bolt being subsequently andindependently retractable by the key used owing to the slottedconnection at 16 with the upper end of the walking beam, this slottedconnection permitting relatively free movement under such conditions.

The thumb bolt has pivotally mounted upon its face, a pivoted springpressed pressure bar 17 whose upper edge engages the end of the long arm18 on the thumb turn hub 13, this arm being positioned in the plane ofthe presser bar 17. The arm 12 of this hub which engages with the notchin the thumb bolt and serves to reciprocate said bolt, is positioneddirectly below and in line with the arm 18, (Fig. 14) but issubstantially shorter, so that the arm 18 will overlie the face of thethumb bolt and will engage with the upper edge of the presser bar 17.Extending substantially at right angles to the arm 18, is an offsettripping arm 19 arranged to cooperate with the releasing shoulder 8 ofthe emergency tumbler 7. A second spring 20 bears against the lower edgeof the pressure bar 17 and holds it against the edge of the arm 18 witha substant al degree of pressure. The arm 18 is of suflicient height onthe hub 13 to project beyond the face of the pressure bar so as topresent the upper portion of its edge to the'tumbler arm 9. WVhen thethumb bolt is projected, the arm 12 which operates the thumb bolt, willbe positioned as shown in Fig. 2 of the drawings, and will be maintainedin such posttion with considerable force by the pressure of the bar 17against the lower edge of the arm 18. In this position rearward orretracting movement of the thumb bolt will act against the arm 12 in aline radial to the hub 13, this arm and hub being maintained in suchposition by the presser bar 17. Consequently, inasmuch as the retractingpressure is in line with the dead center of the thumb turn hub, thethumb bolt will be blocked against retraction by this dead centerposition of the actuating arm 12, and can only be retracted when thisarm 12 has first been moved from this dead center position.

Ordinarily, the emergency tumbler 7 will be supported in a positiontocooperate with the fence because of the supporting engagement of thelug 6 of the first tumbler 6, with the wall 7 on the under face of thesecond or emergency tumbler. Assuming that both the key and thumb boltsare in retracted position, and it is desired to project the thumb boltfrom the inner side of'the lock, the thumb turn hub 13 is turned througha thumb turn 45 or other suitable manually operable means, the thumbbolt being moved from the position shown in Fig. l to that shown in Fig.2, the arm 18 depressing the presser bar 17 and arm 12 engaging with thesides of the notch 11 to move the thumb bolt to projected position.lVhen this movement takes place, the arm 18 will engage the finger 9 ofthe emergency tumbler 7 and will depress both said emergency tumbler andthe first tumbler 6, so that their gated portions will clear the fixedfence 5, and so that, if the key bolt were previously projected with theparts in the position shown in Fig. 1, it will be retracted through thewalking beam 15, the parts moving from the position shown in Fig. 1 tothat shown in Fig. 2 in which position the arm 12 will be held on a deadcenter by the presser bar described, and the thumb bolt can only beretracted from the opposite face of the lock by means of key. controlledmechanism which will move the hub 13 and arm 12 from dead center. I willnow take up the key control mechanism for effecting this result.

In the upper portion of the lock above the key bolt 3 and tumblermechanism, a cylinder lock embodying a rotatable plug cooperates withthe usual spring pressed pin tumblers. The inner end of this rotatableplug 22 isshouldered to receive thereon a roll back 23 having a recessin its rearface and lower end arranged to fit over the shouldered end ofthe plug and having its opposite face channeled at 24 and provided withopposite vertical grooves 25 therein arranged to receive a verticallysliding plate 26 carrying at its upper end and offset from the body ofthe rollback 23 a head or second roll back 27. The lower end of thisplate 26 is provided with a transverse offset, forming a contact orstrike surface 26 the extremity of this offset being turned down wardlyto provide a second contact or strike edge 28 in a plane below thestrike edge 26*. The rear upper portion of the main cam 23 is providedwith a spring pocket or groove 29 therein, housing a coil spring 30whose upper end bears against the cam body 23 and whose lower endengages a pin 31 rigidly carried by and extending transversely from therear face of the plate 26. This spring normally presses the pin 31against the upper face of the extension 22 of the plug and normallyholds the plate 26 and the second cam 27 in the lowermost ofthreepositions relative to the first cam 23 and roll back, this plate andsecond cam being movable in the guide-ways 25 and against the pressureof the spring 30 byreason of the engagement of certain keys with thestrike edges 26 and 28 respectively.

The specific construction of roll backs is shown in detail in Fig. 7 ofthe drawings, the second and third of the three positions of the secondcam 27 with its plate 26 being designated by dotted lines, the relativepositions of the two types of actuating keys relative thereto beinglikewise so indicated. These keys are shown in Figs. 8, 9 and 10 of thedrawings, wherein A designates one type of key which may be a short key;3 designates another type of key which may be a long key; and Cdesignates a still further type of key which may be also a long key andof different length relative to the first long key B. These keyscotiperate with the roll backs 23 and 27 to operate the bolt mechanismas follows: The key A of the short type is arranged to rotate the plugand roll backs in the full line position shown in Figs. 1 and 7. Theroll back 23 rotates in the plane of the key bolt 3 and of the lug 6 ofthe tumbler 6. The second cam 27 in the position described, is in theplane of the emergency tumbler 7 but is an insufficient distanceradially of the plug to engage with the upper edge of this emergencytumbler. Therefore, when a key of the A type is used, the roll back 23only will engage with the tumbler mechanism, its action being to depressthe first tumbler 6 and to engage the notch 4 to project the key bolt,the gate of the tumbler 6 being positioned on the opposite side of thefixed fence 5 and holding the bolt projected until the tumbler 6 isdepressed and the bolt moved rearwardly again. This projected positionof the key bolt by a key of the A type is illustrated in Fig. 1 of thedrawings, in which it will be seen that the lug 6 of tumbler 6 has movedfrom position shown in Fig. 3 over the wall 7 of the emergency tumblerand to the position shown in Fig. 1. If, in this position of the partsit is desired to retract the key bolt from the opposite side of thedoor, a thumb turn hub 13 may be turned, the arm 18 first depressing theemergency tumbler 7 through its arm 9 and by reason of the engagement ofsaid emergency tumbler with the lug 6 of the tumbler, the latter will bedepressed also to clear the fixed fence. By this time, the arm 12 willhave engaged the notched edge 11 of the thumb bolt and will haveprojected said thumb bolt as heretofore described,'the walking beam 15serving to move the key bolt from the position shown in Fig. 1 to thatshown in Fig. 2, which is the position now occupied by the parts, thethumb bolt being blocked against retraction through the projection ofthe key bolt through key A by reason of the dead center blocking actionof arm 12. This is because the short key A will only depress the firsttumbler 6 which moves independently of the emergency tumbler, so thatthe force transmitted by pressure'of the roll back against bolt 3,through walking beam 15 and against thumb bolt 10, is in a dead centerline. Keys of class B, however, are shorter than keys of class C, butare long enough to engage the strike edge 26 of the plate 26, moving thesecond cam 27 to the lower of the two dotted line positions, indicatedin Fig. 7. The keys of class B can, therefore, rotate the two cams 23and 27 in these respective positions, this rotation of the cams actingagainst the emergency tumbler depresses said tumbler and also thetumbler 6 because of the lug 6 and the engaged wall 7 The projectedposition of the second cam 27 is such that it acts to depress theemergency tumbler a suflicient distance to cause its releasing shoulder8 to engage with the tripping arm 19 of the thumb turn hub and to movesaid arm a sufficient distance to throw the arm 12 off center and torelease said arm from blocking position (see Fig. 3). The continuedrotation of the roll backs will engage with the key bolt 3 and willproject said key bolt and through walking beam 15 will retract the thumbbolt (see Figs. 4 and 5). It will be evident that the keybolt maybe nowretracted without causing any movement of the thumb bolt owing to thefree movement afforded by the slot 16 as will be evident from Fig. 5 ofthe drawings. Thus keys of type Bv may be utilized to retract the thumbbolt from one side of the door when it has been projected from theopposite side. It will, of course, be understood that projection of thethumb bolt from one side serves to retract the key bolt which has beenpreviously projected by a key of class B from the opposite side theemergency tumbler 7 which has been moved forward with the bolt and intothe position shown in Fig. 5 being depressed and with key bolt isretracted through the walking beam 15.

A key of a third class such as the longer C, may be utilized not only toretract the key bolt when projected by keys of either of the two classesheretofore described, and to retract the thumb bolt when projected fromthe opposite side of the door, but this third class of keys may beutilized to lock out opening of the door on which the lock .is mountedfrom either side, although usually this applies mostly to the outerside. This is accomplished by projecting the key it tumbler 6 so thatthe bolt through means controlled through the key C and by blocking thesubsequent retraction of said key bolt through means controlled only bykey C or a key of the same class. To this end the lower edge of the keybolt adjacent its inner end is formed with a recess 32. Mounted in thelock case below the lower edge of the key bolt 3, is a blocking plate 33having a portion of its face extending outward in the lock case and intothe plane of the emergency tumbler 7 and in line with the rear portionthereof. This plate is provided with an abutment or stop lug 3e and ispressed against the under edge of the key bolt by a leaf spring 35, theabutment stop 34 seating in the recess 32 in the lower edge of the keybolt. This plate is guided adjacent its outer end by a pin 35 and at itsinner end is provided with a hooked portion 36. In the position shown inFig. l of the drawings, this hooked portion rests against the upper edgeof a spring pressed latching plate 37 journaled upon the hub 13 of thethumb turn, this plate being provided adjacent its inner end with a stopshoulder 38, its end engaging the post 39 and being yieldingly heldthereagainst by means of a coil spring 40 engaging a pin thereon. In itsnormal position, this plate will be carried by the key bolt and willmove forwardly and rearwardly with said bolt during its projection andretraction, the plate 33 guiding on the stud 35 and on the upper edge ofthe latching plate 37. The second cam 27 when in its normal springpressed position will not depress the emergency tumbler 7 a suflicientdistance to en: gage its lower and rear edge with the face of thisblocking plate 33. When, however, the longer of the long keys is used,the cam 27 will engage the emergency tumbler and will depress it untilits lower edge engages the plate 33 and moves it downwardly to clear itsabutment 3% from the recess of the key bolt so that as the key bolt isnow projected, the plate 33 will not move forwardly therewith, but willbe held pressed downwardly until the key bolt has been projected,whereupon it will be pressed upwardly by its spring to hold its abutmentin the rear of the key bolt, the extremity of the plate being positionedclosely adjacent the edge of the lock case, so that in the event it isattempted to retract the key bolt by any of the keys other than those ofclass C, the rear end of the plate 33 will be carried rearwardly by thekey bolt a very short distance and will abut against the lock case,absolutely blocking retraction of the key bolt through any key otherthan that of the C type.

In order to prevent the blocking plate from being carried forward byfrictional engagement with the key bolt, its hooked end 36 will be movedby the emergency tumbler from the position shown in Fig. 2 downwardlyand over the latching shoulder 38 of plate 37-21 e., from the positionshown in Fig. 2 to that shown in Fig. 4. vVhen' the key bolt hasbeenfully projected, the abutment stop 34 will be pressed upwardly bythe spring 35- to the position shown in Fig. 5 of the drawings, where itwill block the retraction of the key bolt as hereinbefore described. Itwill be evident that the bolt will not be retracted until the key ofclass C is used to again depress the latching plate 33'through theemergency tumbler, moving it fromthe position shown in Fig. 5 to thatshown in Fig. 4: and subsequently retracting the key bolt in the usualmanner, the abutment 34 snapping'up intothe recess 32 as the latter isbrought in line therewith by the retraction of the bolt; As the blockingplate 33 is not moved forwardly with the key bolt when projected by keysof the class C, it will be evident that when the key bolt is thusprojected and dead looked as hereinbefore described, itcmay not beretracted from the opposite side of the look by means of the thumb bolt,as the thumb turn tumbler 7 sufficiently to engageand depress plate 33.I

In Figs. 1 and 6 of the drawings I have shown the usual spring pressedlatch 41 retracted through the usual yoke 42, which in turn is operatedthrough the roll backs 4:3. controlled through the knobs -14 in theusual manner. This latch bolt andits actuating mechanism is of standardconstruction and need not be further and specifically described herein.

While I have herein described a specific embodiment of my invention, itwill be understood that the same may be structurally modified within thespirit of the invention and the scope of the appended claims.

that I claim is 7 1. In a look, a dead bolt, means controlled by one ofa plurality of keys for projecting and retracting said bolt, meanscontrolled by another and'diiferent of said plurality of keys forprojecting said bolt and for blocking its subsequent retraction throughsaid first named key, and means controlled by a third and certain key ofsaid plurality of keys for projecting said bolt and including meansseparate from the aforesaid keycontrolled bolt-operating means andcooperating with said bolt to block its subsequent retraction throughsaid first and second named keys.

2. In a look, a dead bolt, means controlled by one of a plurality ofkeys for projecting and retracting said bolt, means controlled byanother and different of said plurality of keys for projecting said boltand for blocking its subsequent retraction through said first named key,and means controlled arm 18 does not depress the.

key and said by a third and certain key of said plurality of keys forprojecting said bolt and including means separate from the aforesaidkeycontrolled bolt-operating means and cooperating with said bolt toblock its subsequent retraction through any other of said plurality ofkeys.

3. In a look, a dead bolt, means controlled by one of a plurality ofkeys for projecting and retracting said bolt, means controlled byanother and different of said plurality of keys for projecting said boltand for retracting said bolt when previously projected by said first andsecond mentioned keys and for blocking its subsequent retraction throughsaid first named key, and means controlled of said plurality of keys forprojecting said bolt and including means separate from the aforesaid keycontrolled bolt operating means and cooperating with said bolt to blockits subsequent retraction through said first and second named keys.

a. In a lock, adead bolt, a plurality of I keys for operating said bolt,one of said keys being a short key and at least two other of. said keysbeing longer relative to said short key and of different relativelengths, means controlled by said short key for projecting andretracting said dead bolt, means controlled by one of said long keys forprojecting said bolt and for blocking its subsequent retraction throughsaid short key, and means controlled by the other of said long keys forprojecting said bolt and blocking its subsequent retraction through saidshort first mentioned long key,

5. In a lock, a dead bolt, a plurality of keys for operating said bolt,one of said keys being a short key and at least two other ofsaid-keysbeing longer relative to said short key and of different relativelengths, means controlled by said short key for projecting andretracting said dead bolt, means controlled by one of said long keys'forprojecting said bolt and for blocking its subsequent retraction'throughsaid short key, and means controlled by the other of said long keys forretracting said bolt when previously projected through said short andfirst mentioned longrkeys and for projecting said bolt and blocking itssubsequent retraction through said short key and said first mentionedlong key.

6. In a look, a dead bolt, a cylinder lock mechanism cooperatingtherewith and including a plurality of keys, at least one of said keysbeing a short key and at least two other of said keys being longerrelative to said short key or keys and of different relative lengths,means controlled by a short key for projecting and retracting said ,deadbolt, means controlled by the shorter of said two long keys forprojecting said bolt and for blocking its subsequent retraction by athird and certain key through a short key, and means controlled by theother of said long keys for projecting said bolt and for blocking itssubsequent retraction through said short and first mentioned long key.

7 In a look, a dead bolt, a cylinder lock mechanism coiiperatingtherewith and including a plurality of keys, at least one of said keysbeing a short key and at least two other of said keys being longerrelative to said short key or keys and of differentvrelative lengths,means controlled by a short key for projecting and retracting said deadbolt, means controlled by the shorter of said two long keys forprojecting said bolt and for blocking its subsequent retraction througha short key, and means controlled by the other of said long keys forretracting said bolt when previously projected through a short key orthe first mentioned long key, and for projecting said bolt and blockingits subsequent retraction through any other and different key of saidplurality of keys.

8. In a lock, a dead bolt, a tumbler cooperating therewith, an emergencytumbler cooperating with said first tumbler and bolt positioned in adifierent operative plane from said first tumbler and arranged in oneposition to block retraction o fsaid bolt, a movable blocking membercooperating with said emergency tumbler and bolt, a cylinder lockmechanism including a cam arranged to operate said first tumbler andbolt, a second cam in a different plane from the first and in theoperative plane of said emergency tumbler, said second cam being movablerelative to the first and to said Y emergency tumbler into at leastthree relative positions, with means normally holding said cam in one ofsaid positions, at least one of saidplurality of keys being arranged torotate saidfirst cam to project and retract said bolt, at least oneother of said plurality of keys being arranged to move said second camto a second position and to rotate the same to operate said emergencybolt, said tumbler being positioned upon bolt projection to block boltretraction through said first cam and tumbler, and at least one furtherof said plurality of keys being arranged to movevsaid second cam to athird' position and to rotate saidcam to operate saidemergency tumblerand boltto project the latter ,and to position said blocking member toblock subsequent retraction of said bolt through any other and differentkey of said plurality of keys.

9. In a lock, a dead bolt, means controlled by a plurality of keys andoperable from one side of the lock for projecting and retracting saidbolt, a, second dead bolt, means manually operable from the oppositeside of the lock for projecting and retracting -said second bolt, meansof connection between tumbler and said bolts whereby said second boltmay be retracted through the projection of said first bolt, and meanspositioned upon the manually controlled projection of said second boltto cooperate therewith and block retraction thereof by projection ofsaid first bolt through at least one of said plurality of keys. 7

10. In a look, a dead bolt, means controlled by a plurality of keys andoperable from one side of the lock for projecting and retracting saidbolt, a second dead bolt, means manually operable from the opposite sideof the lock for projecting and retracting said second bolt, means ofconnection between said bolts whereby said second bolt may be retractedthrough the projection of said first bolt, and means positioned upon themanually controlled projection of said second bolt to cooperatetherewith and block projection of said first bolt through at least oneof said plurality of keys.

11. In a look, a dead bolt, means controlled by a plurality of keys andoperable from one side of the lock for projecting and retracting saidbolt, a second dead bolt, means manually operable from the opposite sideof the lock for projecting and retracting said second bolt, means ofconnection between said bolts whereby said second bolt may be retractedthrough theprojection of said first bolt, andmeans'positioned upon themanually second bolt to cooperate therewith and block retraction thereofby projection of said first bolt through at least one of said pluralityof keys, and means controlled by another and certain keyof saidplurality of keys for moving said blocking means to inoperative positionand for subsequently pro-- jecting said first bolt to retract saidsecond bolt through the means of connection aforesaid, said connectingmeans permitting subsequent retraction of said first bolt withoutresultant projection of the second bolt.

12.In a look, a dead bolt, means controlled by a plurality of keys andoperable from one side of the lock for projecting and retracting saidbolt, a second dead bolt, means manuallyoperable from the opposite sideof the lock for projecting and retract ing said second bolt, means ofconnection betveen. said bolts whereby said second boltmayberetractedthrough the projectionof said first bolt and whereby said firstbolt when projected by at least one of said plurality of keys, may beretracted through projection of said second bolt,the latter beingsubsequently and independently retractable, and meanspositioned upon'themanually controlled projection of said second bolt to cooperatetherewith and block retraction thereof by projection of said first boltthrough at least one of said plurality of keys.

controlled pro ection of said 13. In a look, a dead bolt, meanscontrolled by plurality of keys and operable from one side of the lockfor projecting and retracting said bolt, a second dead bolt, manuallycontrolled means therefor operable from the opposite side of the lockand including a hub journaled in the lock, and a radial arm on said hubarranged to engage said second bolt to project and retract the same uponthe manual actuation of the hub, means of connection between said firstand second bolts whereby the second bolt may be retracted by theprojection of the first bolt through certain of said keys, said radialarm upon projection of said second bolt being positioned on a deadcenter with the line of retracting movement of said second bolt to blockretraction thereof and to block projection of said first boltby at leastone of said plurality of keys.

14-. In a look, a dead bolt, means controlled by a plurality of keys andoperable from one side retracting said bolt, a second deadbolt, manuallycontrolled means therefor, operable from the opposite side of the lockand including a hubv journaled in the lock, and a radial arm on said hubarranged to engage said second bolt to project and retract the same uponthe manual actuation of the hub, means of connection between said firstand second bolts whereby the second bolt may be retracted by theprojection of the first bolt through certain of said keys, said radialarm upon projection of said second bolt, being'positioned on a deadcenter with the line of retracting movement of said second bolt to blockretraction thereof and to block pro-- jection'of said first bolt by atleast one of said plurality of keys, and releasing means for saidcontrolled by the aforesaid certo the projection of said first bolt bysaid certain of said keys.

15. In a lock, a dead bolt, means con-I trolled by one of a plurality ofkeys and operable from one side of the lock for projecting and retractinsaid bolt, a second dead bolt manually operable from the opposite sideof the lock, means of connection etween said bolts whereby theprojection of the first bolt by another'of said plurality of keysoperates to retract said second bolt when previously projected, meanscontrolled by one of said plurality of keys other than saidfirstmentioned key for projecting said first bolt and for blocking itssubsequent retraction through said first named key, and means controlledby a further and certain key of said plurality of keys for projectingsaid first bolt and for blocking its subsequent retraction through anyother of said plurality of keys.

16. In a look, a dead bolt, means conof the lock for pro ecting andtrolled by one of a plurality of keys and operable from one side of thelock forprojecting and retracting said bolt, a second. dead boltmanually operable from the opposite side of the lock, means ofconnection between said bolts whereby the projection of the first boltby another of said plurality of keys operates to retract said secondbolt when previously projected, and whereby projection of said secondbolt operates to retract said first bolt when previously projectedthrough said first named key, means controlled by one of said pluralityof keys other than said first mentioned key for projecting said firstbolt and for blocking its subsequent retraction through sai first namedkey, and means controlled by a further and certain key of said pluralityof keys for projecting said first bolt and for blocking its subsequentretraction through any other of said plurality of keys.

17. In a lock, a dead bolt, means controlled by one of a plurality ofkeys and operable from one side of the lock for projecting andretracting said bolt, a second dead bolt manually operable from theopposite side of the lock, 1 leans of connection between said boltswhereby the projection of the first bolt by another of said plurality ofkeys operates to retract said second bolt when previously projected,means controlled by one oi said plurality of keys other than said firstmentioned key for projecting said first bolt and for. blocking itssubsequent retraction through said first named key, and means controlledby a further and certain ke of said luralit ofke s for retractin saidfirst bolt when projected through said first and second mentioned keysand for projecting said first bolt and for blocking its subsequentretraction through any other of said plurality of keys.

18. In a look, a dead bolt, means controlled by one of a plurality ofkeys and operable from one side of the lock for projecting andretracting said bolt, a second dead bolt manually operable from theopposite side of the lock, means of connection between said boltswhereby the projection of the first bolt by another of said plurality ofkeys operates to retract said second bolt when previously projected, andwhereby projection of said second bolt retracts said first bolt whenpreviously projected by at least one of said plurality of keys, meanscontrolled by one of said plurality of keys other than said firstmentioned key for projecting said first bolt and for blocking itssubsequent retraction through said first named key, and means controlledby a further and certain key for projecting said first bolt and forblocking its subsequent retraction through any other of said pluralityof lgeys, and by the projection of said second first mentioned 19. In alook, a dead bolt, means controlled by one of a plurality of keys andoperable from one side of the lock for projecting and retracting saidbolt, a second dead bolt manually operable from the opposite side of thelock, means of connection between said bolts whereby the projection ofthe first bolt'by another of said plurality of keys opcrates to retractsaid second bolt when previously projected, and whereby projection ofsaid second bolt operates to retract said first bolt when previouslyprojected through said first named key, means controlled by one of saidplurality of keys otherthan said first mentioned key for projecting saidfirst bolt and for blocking its subsequent retraction through said firstnamed key, and means controlled by a further and certain key forprojecting said first boltand for blocking its subsequent retractionthrough any other of said plurality of keys and through the projectionof said second bolt.

20. In a lock, adead bolt, means controlled by one of a plurality ofkeys and operable from one side of the lock for projecting andretracting said belt, a second dead bolt manually operable from theopposite side of the lock, means of connection between said boltswhereby the projection of the first bolt by another of plurality or"keys operates to retract said second bolt when previously projected, andwhereby the projection of said second bolt operates to retract saidfirst bolt when previously projected by at least one of said pluralityof keys, means controlled by one of said plurality of keys other thansaid key for projecting said first bolt and for blocking its subsequentretracti on through said first named key, and means controlled by afurther and certain key for retracting said first bolt when projectedthrough said'first and second mentioned keys and for projecting saidfirst bolt and for blocking its subsequent retraction through any otherof said plurality of keys, and through the projection of said secondbolt.

21. In a lock, a dead bolt, tumbler mechanism therefor, means controlledby one of at least three difierent keys for operating said tumblermechanism to project and retract said dead bolt, means controlled byanother of said three keys for so operating said bolt and for blockingthe retraction of said bolt through said first key, with movablebolt-blocking means independent of said belt and tumbler mechanism, andwith means controlled by the third of said keys for operating saidtumbler mechanism to project and retract said bolt and for operatingsaid blocking means, upon bolt projecting movement,,to move the same toblock retraction of said bolt through said first and second keys.

22. In a lock, a dead bolt, tumbler mechanism therefor, means controlledby one of move the same to block retraction of said bolt through saidfirst and second keys.

23. In a look, a dead bolt, tumbler mechanismtherefor, meanscontrolledat least three difierent'keys for projecting and retracting said boltand including key-controlled tumbler operating means, movable boltblocking means separate from said bolt and tumbler mechanism and movedthrough one certain of said different keys upon projection ofsaid bolt,to block retraction of said bolt through any of the other of said keys.p 7

24. In a look, a dead bolt, tumbler mechanism therefor, means controlledby at least three different keys for projecting and retracting said boltand including key-controlled tumbler operating means, movable boltblocking means separate from said bolt and tumbler mechanism and movablethrough said tumbler mechanism, when operated by a certain key only ofsaid different keys, to block subsequent retraction of said bolt by anyof the other of said keys.

; In a look, a dead bolt, tumbler mechaat least three keys of differentrelative nism therefor, means controlled by at least three differentkeys for operating said tumbler mechanism and projecting and retractingsaid bolt, said keys being of different relative lengths and saidkey-controlled means including tumbler operating means having adifferent operative position for each of said keys, bolt blocking meansseparate from the bolt and tumbler mechanism and normally moving withsaid bolt but movable relatively thereto through said tumbler mechanism,upon bolt projection and tumbler actuation by a certain key only of saiddifferent keys, into and out of position to' block subsequent retractionof said bolt through any other of said keys.

26. In a look, a dead bolt, tumbler mechanism therefor, means controlledby at least three difierent keys for operating said tumbler mechanismand pro ecting and retracting saidbolt, said keysbeing of different'relative lengths and said key-controlled means including tumbleroperating means,

having a different operative position for each of said keys anddifferent degrees'of tumbler movement, bolt blocking means separate fromthe bolt and tumbler mecha nism and normally moving with said bolt butmovable relatively thereto through sa d 7 tumbler mechanism, upon boltprojection and tumbler actuation by a certain key only of said differentkeys, into and out of position to block subsequent retraction of saidbolt through any other of said keys. p

f NORMAN BIHU'RD. V Witnesses: V

-' R, S. GOLD,

W. L. VVILLIAMs.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

